init: add keychords_test

Test: init_tests --gtest_filter=keychords.*
Bug: 64114943
Change-Id: I357d0c1bd56660ac28bc02b76d5632ef1b9328b7
diff --git a/init/Android.bp b/init/Android.bp
index a3083c1..517847c 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -170,6 +170,7 @@
     srcs: [
         "devices_test.cpp",
         "init_test.cpp",
+        "keychords_test.cpp",
         "persistent_properties_test.cpp",
         "property_service_test.cpp",
         "property_type_test.cpp",